International conference "Food security and climate change: 4 per 1000 initiative new tangible global challenges for the soil" International conference "Food security and climate change: 4 per 1000 initiative new tangible global challenges for the soil", Jun 2019, Poitiers, France. 2019 International conference "Food security and climate change: 4 per 1000 initiative new tangible global challenges for the soil", Poitiers, FRA, 2019-06-17-2019-06-20